Fixed an issue with inline functions in the config object used as transition actions not having their argument types inferred #3228
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…nsition actions not having their argument types inferred
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davidkpiano
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Apr 16, 2022
| on: { | ||
| EVENT_WITH_FLAG: { | ||
| actions: (_context, event) => { | ||
| ((_accept: 'EVENT_WITH_FLAG') => {})(event.type); |
davidkpiano
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…nsition actions not having their argument types inferred (statelyai#3228) * Added a failing test for inference with inline actions * Fixed an issue with inline functions in the config object used as transition actions not having their argument types inferred * Fix small type errors * Try a solution based on merging the mapped type Co-authored-by: Matt Pocock <mattpocockvoice@gmail.com>
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fixes #3217
TS minimal repro
Minimal repro fixed with Compute
The problem is in the fact that we are using an intersection here and TS doesn't the contextual type for a function in such a situation. I'm working a on a fix for this in the TypeScript itself, here, but until that lands... we must avoid an intersection here and by using
Computewe make the type at this position to be computed earlier and thus TS can treat it an object type when needed.EDIT:// actually...
Compute-based solution caused our CI to got out of memory, so I've simplified the fix and just "merged" the intersection manually, into a single mapped type